火灾爆炸作用下921A钢力学性能及本构关系
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摘要
采用万能试验机和霍普金森压杆(SHPB)系统,对火灾爆炸下921A钢高温力学性能及动态力学性能进行研究。基于试验数据,分别拟合Johnson-Cook本构模型、Cowper-Symonds本构模型,修正Cowper-Symonds模型应变硬化项,并通过试验验证了有效性。参考Johnson-Cook本构模型温度项耦合方法,建立综合考虑温度软化效应和应变率强化效应的921A钢本构模型。
The high temperature mechanical properties and dynamic mechanical properties of 921 A steel under fire and explosion are studied by using universal testing machine and Split Hopkinson Pressure Bar(SHPB) system. Based on the test data, the Johnson-Cook constitutive model and the Cowper-Symonds constitutive model are fitted, and the strain hardening term of the Cowper-Symonds model is modified. Their validity is verified by tests. Referring to the method of coupling of temperature term in Johnson-Cook constitutive model, a 921 A steel constitutive model considering the temperature softening effect and strain rate strengthening effect is established.
The high temperature mechanical properties and dynamic mechanical properties of 921 A steel under fire and explosion are studied by using universal testing machine and Split Hopkinson Pressure Bar(SHPB) system. Based on the test data, the Johnson-Cook constitutive model and the Cowper-Symonds constitutive model are fitted, and the strain hardening term of the Cowper-Symonds model is modified. Their validity is verified by tests. Referring to the method of coupling of temperature term in Johnson-Cook constitutive model, a 921 A steel constitutive model considering the temperature softening effect and strain rate strengthening effect is established.
引文
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[2]朱锡.921A钢动态屈服应力的实验研究[J].海军工程学院学报,1991(2):43-48.
[3]李翔城,陈荣,卢芳云,等.921A钢的Johnson-Cook模型参数拟合[C]//第十八届全国疲劳与断裂学术会议.2016.
[4]European Committee for Standardization.Eurocode 3:Design of Steel Structures-Part 1-2:General Rules-Structural Fire Design.Brussels:NEN-EN 1993-1-2[S].2005.
[5]建筑钢结构防火技术规范:CECS200:2006[S].北京:中国计划出版社,2001.
[6]金属材料拉伸试验第1部分:室温试验方法:GB/T228.1-2010[S].2002.
[7]金属材料高温拉伸试验方法:GB/T 4338-2006[S].2006.
[8]于文静.导管架海洋平台钢结构在爆炸和火灾作用下的力学性能研究[D].上海:上海交通大学,2012.
[9]强旭红,吴钟艳,姜旭,等.高强结构钢S690高温力学性能[J].同济大学学报,2016,44(5):685-694.
[10]JOHNSON G R,COOK W H.A Constitutive Model and Data for Metals Subjected to Large Strains,High Strain Rates and High Temperature[C]//Proceedings of the Seventh International Symposium on Ballistics.1983.
[11]KLEPACZKO J D,MALINOWSKI Z.High Velocity Deformation of Solids[M].Berlin:Spring-Verlag,1978.
[12]李营,李晓彬,吴卫国,等.基于修正CS模型的船用低碳钢动态力学性能研究[J].船舶力学,2015,19(8):944-949.